SCS>...
SCS>  object vtm=new object();
SCS>  vtm=Missing.Value;

SCS>  object[] cnt=new object[4]{null, null, null, "TABLE"};
SCS>...
SCS>  rs=(ADODB.RecordsetClass)(cn.OpenSchema(ADODB.SchemaEnum.adSchemaTables, cnt, vtm));
SCS>...
SCS>